Numbers k such that k and k^2 use only the digits 1, 2, 3, 4 and 8.

Terms

a(0) =1a(1) =2a(2) =11a(3) =12a(4) =18a(5) =21a(6) =22a(7) =38a(8) =111a(9) =122a(10) =182a(11) =221a(12) =338a(13) =428a(14) =482a(15) =488a(16) =1111a(17) =1132a(18) =1188a(19) =1488a(20) =1812a(21) =3338a(22) =3482a(23) =4338a(24) =4341a(25) =4818a(26) =4832a(27) =11128a(28) =11141a(29) =11332